Speaker System, Basic Function - GF82.62-P-9900A

Model all (CAR) 

Overview 

This document contains information on:

• Function of the speaker system
• Restricted speaker actuation
• Actuation of the speakers during an emergency call
• Support of communication in the vehicle (dependent on model and equipment installed)

General 

The task of the speaker system is to output the audio information from various systems via the speakers in the vehicle. Sources for the audio information can be the radio, media or the telephone, for example. Depending on the equipment installed, the speaker system is controlled either by the multimedia system control or by the sound system amplifier control unit.

Function of the speaker system 

Each source converts the audio information into analog audio signals. Then an amplifier amplifies the analog audio signals and transmits them to the speakers. Depending on the equipment installed, the amplifier is either integrated in the multimedia system control or is installed in the vehicle as an independent control unit.

The subwoofer amplifier is optionally used. This additionally amplifies the analog audio signals to the rear subwoofer.

Each speaker is optimized for its tasks, e.g. according to the various frequency ranges. The speakers installed differ in terms of quality, number and installation location depending on the model and equipment level.

The user can operate the volume and tone of the speaker system via the multimedia system. When an emergency call is triggered, the telematics services control unit mutes the audio sources.

Restricted speaker actuation 

During voice output, the amplifiers primarily actuate the speakers in the front area of the vehicle.

Actuation of the speakers during an emergency call 

For the emergency call system, the center instrument panel speaker is connected directly to the telematics services control unit. This means that the function of the emergency call is assured independently of the speaker system.

In addition, the telematics services control unit transmits a signal with the request for the mute function to the sound system amplifier control unit or to the multimedia system control.

Support of communication in the vehicle (dependent on model and equipment installed) 

In some vehicles entertainment to all the seat rows can be made easier with acoustic support. To achieve this, the speaker system also outputs the words spoken in one seat row in the speakers assigned to the other seat row. In the basic variant, the hands-free system microphones records what is spoken in the front seats and the speakers in the rear emit the signals too. This means that what is spoken in the first seat row can also be heard better in the second seat row. With the maximum equipment, additional microphones are fitted in the rear, so that communication between the seat rows can be supported in both directions by the speaker system.

The function is switched on and off using the multimedia system control. Different volume levels can also be selected to support communication.

Sound areas (dependent on model and equipment installed) 

By using speakers fitted close to the ear it is possible to achieve greater seat position-specific individualization of the volume and tone settings. This enables, e.g. more privacy and less disturbance for co-passengers when the hands-free system is used.

	Function schematics
	Function schematic for actuating speakers	Model 118, 177 except engine 139, model 247	PE82.62-P-2501-97A
		Model 118, 177 with engine 139	PE82.62-P-2501-97D
		Model 167	PE82.62-P-2501-97B
		Model 293	PE82.62-P-2501-97C
	Further basic functions
	Volume adjustment to noise level, basic function		GF82.60-P-1000A
	Engine sound, basic function	Model all (CAR) with code 97B (Engine noise reduction via speakers (EOC)) Model all (CAR) with code B63 (Sporty engine sound) Model all with engine 139 except code 97B (Engine noise reduction via speakers (EOC)) except code B63 (AMG eSound)	GF82.60-P-9901A
	Radio mode, basic function		GF82.60-P-9902A
	Media mode, basic function		GF82.60-P-9903A
	TV mode, basic function	Model all (CAR) with code 865 (digital TV)	GF82.60-P-9904A
	Telephone, basic function		GF82.70-P-9902A
	Multimedia system control, basic function		GF82.85-P-9904A
	Emergency call system, basic function	Model all (CAR) with code 362 (HERMES communications module LTE)	GF82.95-P-9900A
	Control units
	Sound system amplifier control unit, basic function	All models with code 810 (Sound system), with code 811 (Advanced sound system), with code 97B (Engine noise reduction through speaker (EOC)) or with engine 139	GF82.62-P-9890A
	Components
	Subwoofer amplifier, basic function	Model all (CAR) with code 811 (High-End sound system) Model all (CAR) with code 853 ("Midline" sound system)	GF82.62-P-9891A